... machine board main card servo driver Detailed Product Descriptionsupply all type dahao computer cards:(1):322 series: E620(main card),E9102 ... card),EF190(upper thread driver card),ms21(stepping motor driver),EF119(Needle position card),E871/E874(coiling ... EF117A(10):dahao special controlling board:MCB(main shaft control board),EF732k(frequency conversioncontrol board),EF148E(sequin control board), ...